opportune 发表于 2025-3-28 17:32:43
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http://reply.papertrans.cn/27/2635/263451/263451_45.png开花期女 发表于 2025-3-29 14:31:39
https://doi.org/10.1057/9781403982858 determine which transformations preserve beads. We give conceptually easy first-order complete query languages and computationally complete query languages for trajectory databases, which allow to talk directly about speed and beads. The queries expressible in these languages are invariant under speed- and bead-preserving transformations.Trigger-Point 发表于 2025-3-29 17:08:25
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Contested Bodies of Childhood and Youtht conjunctive queries – in fact, no monotonic language is sufficiently powerful. We also exhibit several well-behaved classes of conjunctive views and queries for which conjunctive rewritings remain sufficient. This continues a previous investigation of rewriting and its connection to semantic determinacy, for various query and view languages.